[Theme Horse Support Team]

Hi sonja,
There is no any featured image. So i just added the image. Just use the image size (1030 * 460) for the best image for narrow-layout slider and for wide layout use (1400 * 460) for wide layout.

To display in the slider its important to be kept in featured image not in the editor. Just view this screen shot
http://awesomescreenshot.com/09b3nifk49
This featured image is at right bottom of the page / post

Thank you!